NRF52840 SuperMini Dev Board – Bluetooth 5 & Charging

SuperMini NRF52840 Development Board – Bluetooth 5 Compatible with Nice!Nano V2.0

The SuperMini NRF52840 Development Board is a compact, powerful microcontroller board built around Nordic Semiconductor's nRF52840 SoC. Designed as a direct Pro Micro-compatible alternative, it works seamlessly with virtually any Pro Micro keyboard layout and is fully compatible with the popular Nice!Nano V2.0 pinout. Whether you're building a custom wireless keyboard or working on a low-power Bluetooth IoT project, this board delivers impressive performance in a tiny footprint.

Key Features

• Powerful Wireless: Bluetooth 5.0 with onboard antenna — supports Bluetooth, Thread, Zigbee, ANT, and 2.4GHz protocols
• ARM Cortex-M4F CPU: clocked at 64MHz with 1MB built-in flash memory and 256KB RAM
• Battery Charging Management: built-in lithium battery charging chip supporting 3.7V Li-ion charge and discharge
• Ultra-Low Standby Power: standby power consumption as low as 1mA with software-controlled LED power cutoff
• Pro Micro Pin-Compatible: drop-in replacement for Pro Micro keyboards; same pinout for easy integration
• Rich Peripheral Support: ADC, PWM, SPI, I2C, UART, USB, GPIO, AES encryption, SHA-256 hashing, and True Random Number Generator (TRNG)
• External VCC Control: set P0.13 low to cut power to the 3.3V/VCC pin, reducing idle current draw from components like RGB LEDs

Hardware Specifications

• Chipset: Nordic Semiconductor nRF52840
• Processor: ARM Cortex-M4F @ 64MHz
• Flash Memory: 1MB built-in
• RAM: 256KB
• Wireless: Bluetooth 5.0, Thread, Zigbee, ANT, 2.4GHz
• Battery Interface: 3.7V lithium battery (B+ / B- pads)
• Standard Charging Rate: 100mA (BOOST mode: 300mA — requires battery capacity >500mAh)
• Connectivity: USB for programming and power

Power Supply & Battery

The SuperMini NRF52840 supports charging and discharging of a 3.7V lithium battery. The default charging rate is 100mA (a 2000mAh battery takes approximately 20 hours to fully charge). For faster charging, the BOOST pad can be bridged to increase the charging current to 300mA — only use this when the battery capacity exceeds 500mAh.

To connect an external battery, simply solder the positive terminal to B+ and the negative terminal to B−. Note: Take care to avoid short-circuiting the positive and negative poles during soldering.

Entering Bootloader Mode

To enter Bootloader mode, short RST to GND twice within 0.5 seconds. Once connected to your computer via USB, a storage device named "Nice!Nano" will appear. You can then drag and drop a .uf2 firmware file directly onto the drive to flash the board.

What's in the Box

• 1× SuperMini NRF52840 Development Board

Made in Mainland China.

Learn more: ENERGY STAR product efficiency guidance

Frequently Asked Questions

Q: Is the SuperMini NRF52840 board compatible with ZMK firmware for wireless keyboards?

A: Yes, the SuperMini NRF52840 development board is compatible with ZMK firmware, which is a popular open-source keyboard firmware designed for wireless keyboards. Its Nice!Nano V2.0 compatibility and Pro Micro pinout make it a common choice for custom wireless keyboard builds using ZMK.

Q: What battery size should I use with the NRF52840 SuperMini board?

A: The board supports any 3.7V lithium battery connected via the B+ and B− pads. At the standard 100mA charging rate, a 2000mAh battery takes around 20 hours to fully charge. If you bridge the BOOST pad to enable 300mA charging, ensure your battery capacity is greater than 500mAh to operate safely.

Q: Can I use the NRF52840 SuperMini as a drop-in replacement for a Pro Micro in my keyboard build?

A: Absolutely. The SuperMini NRF52840 board shares the same pinout as the Pro Micro, meaning it can be used as a direct replacement in almost any Pro Micro-compatible keyboard case or PCB, adding Bluetooth 5.0 wireless capability and built-in battery charging management.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.